Not so long ago, scientists couldn't say with much confidence that black holes existed, nor did they know that a giant one sits at the center of our own galaxy. Yesterday, the Nobel Committee recognized decades of black-hole research by awarding its physics prize to three scientists. Half the prize went to Roger Penrose, of the University of Oxford, who showed that black holes could exist, and half went to Reinhard Genzel, of the Max Planck Institute for Extraterrestrial Physics and UC Berkeley, and Andrea Ghez, of UCLA, who provided the most convincing evidence that a particular black hole - the supermassive one at the center of our Milky Way - did indeed exist. For more on this, see our press release at Berkeley News. Stories on this topic have appeared in dozens of sources, including NBC News, The Washington Post, The Wall Street Journal, CNN, NPR, Vox, and The Mercury News.